频率选择性衰落信道下的同步参数联合盲估计算法

发布时间：2018-07-09 13:30

本文选题：多径频率选择性衰落 + 低信噪比　；参考：《数据采集与处理》2017年01期

【摘要】：对于多径频率选择性衰落信道以及低信噪比环境下线性调制信号的同步参数盲估计问题,提出基于循环累积量的载波频偏、初始相偏和符号定时误差前向联合盲估计算法。通过理论推导得出多径频率选择性衰落信道下信号的循环累积量与初始相偏和符号定时误差的数学关系。在此基础上先以较大频率间隔进行粗估计确定频偏范围,再以较高精度遍历检测信号特定循环频率,提高载波频偏估计精度,进而由累积量值估计出初始相偏和符号定时误差,不依赖于信道衰落和加性噪声的分布特性,尤其适用于频偏、相偏、定时误差和信道衰落同时存在的复杂情况。仿真结果表明,该算法能有效实现低信噪比和多径频率选择性衰落信道下对线性调制信号同步参数的联合盲估计。
[Abstract]:For the blind estimation of synchronization parameters for multipath frequency selective fading channels and linear modulation signals in low SNR environment, a forward joint blind estimation algorithm for carrier frequency offset, initial phase offset and symbol timing error based on cyclic cumulants is proposed. The mathematical relationship between the cyclic cumulant and the initial phase offset and symbol timing error in multipath frequency selective fading channel is derived theoretically. On the basis of this, the range of frequency offset is determined by coarse estimation at large frequency intervals, then the frequency offset range is determined by traversing the specific cycle frequency of the detection signal with high accuracy, which improves the accuracy of carrier frequency offset estimation, and then estimates the initial phase offset and symbol timing error from the accumulative value. It is not dependent on the distribution of channel fading and additive noise. It is especially suitable for complex cases of frequency offset, phase offset, timing error and channel fading. Simulation results show that the proposed algorithm can effectively achieve joint blind estimation of synchronization parameters of linear modulation signals in low SNR and multipath frequency-selective fading channels.
【作者单位】：解放军信息工程大学信息系统工程学院;
【分类号】：TN911.23

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